Lens-blccking device



Patentd Oct. 12,1920.

3 SHEETS-SHEET I.

INVENTOR.

L uc/g/v 14/. 51/6856 A TTORNEYS L. w. BUGBEE. LENS BLOCKING DEVICE.

APPLICATION FILED MAR. 3,1919.

Patented Oct.

12, SH EE 3 SHEETS INVENTOR.

Lac/An M Basses A TTORNEYS L. W. BUGBEE.

LEMNS BLOCKING DEVICE. APPLICATlQN FILED MAB. 3.. 1.919,.

1,355,211, I Patented Oct. 12,1920.

3 SHEETS-SHEET 3.

INVENTOR.

Lac/,4. M50465:

A TTORNEYJ' citizen of the UNITED STATES PATENT OFFICE.

LUCIAN w. BUGBEE, or INnraNAronrs,rNnraNanssIeNoEt To ONEBiEGE B'I'FOCAL LENS COMPANY, or INDIANAPOLIS, INDIANA, A CORPORATION.

LENS-BLCCKING- DEVICE.

Specification of Letters Patent.

Patented Oct. 12, 1920'.

Application filed March 3,1919. Serial No. 280,423.

T 0 all 00. mm it may concern Be it known that I, LUCIAN W BUGBEE, a United States, and a resident of Indianapolis, county of Marion, and

State of Indiana, have invented a certain new and useful Lens-Blocking Device; and

I do hereby declare that the following is a full clear, and exact description thereof,

reference being had to theaccompanying drawings, in which like numerals refer to like parts. 1

The object of this invention is to coni' enien-tly, accurately andsecurely mount or block lens blanks on spotting wheels, pre paratory to grinding or polishing them.

This invention has been made particularly for use in the manufacture of toric lenses, but it is not limited to such use as substantially the same idea can be employed in manufacturing other lenses. Heretofore there has been difficulty in securely mountinglens blanks on the spotting wheels and locating the lens blank holders. It is desirable, and absolutely necessary in; the manufacture of good lenses, that all parts of the lens blank, and therefore the surface or the spot on which it is secured,

shall be exactly equidistant from the center. of the wheel. .That properly balances the blank so that when it'is ground by the wheel being presented tangentially to thegri-nchng wheel, all of the lenses will bemade of uniform thickness and there will be none of them prismatic or otherwise defective.

This invention consists of means for securing the finished inner surface of each lens blank directly on and against the metal surface of the spots on the wheel, and without any chance for the blanks to be improperly mounted and means for individually pressing and holding each blank in place until secured.

The full nature of the inventionherein involved will appear more fully from the accompanying drawings and the following description and claims.

In the drawings Figure 1 is a plan view of means for mounting lens blanks on a spotting wheel. Fig. 2 is a section therethrough on line 22 of Fig. 1. Fig. 3 is a part of Fig. 2 on a larger scale, and showing means for forcing the lens blank agalnst the wheel, in its outer and idle position. Fig. d is sectional view of the presser head shown in Fig. 3. Fig. 5 is a side elespotting wheel with no blanks thereon.

The spotting wheel herein shown consists of awheel 10 having a rim 11, and on the. periphery; of said wheel there are anumbe'r of spots 12 so that the lens blanks 13 may be secured thereto. The lens blanks shown herein have minus inner surfaces of a uniform curvature, of say 6 diopter. Every spot 12 is also made with a curvature of substantially the same d-iop'ters, or prefer? ably 5.87 diopters so as to leave a space in the central part for pitch or other adhesive material and sothat. the edges of the blank will fit down tight on the metal of the spots. The spots are preferably rectangularas shown in Fig. -6 so that the rectangular blanks may be used for bringing thei-r adjacent. edges close together and their lateral edges uniform for facilitating the grinding and polishing.

Theinvention hereln consists in the means shown in Figs. 1 to 4 for. conveniently, ac-- c-urately and securely mounting the lens blanks cn the spotting wheel.

A. dish shaped frame 15 seen in Figs. 1 and 2, is formed with central stud 16 on which the spotting wheel is mounted as shown in Fig. 2. Upon the bottom of the frame 15 a rib 17 is provided concentric with the frame 15- and the stud 16 so as to properly place the spotting wheel and have the sidesthereof truly balanced. Then the lens blanks 18, which have a thin layer of pitch placed in the concave surface thereof, are placed against the periphery of the spotting wheel by resting the lower edges of the blanks on the setting blocks 19 arranged at intervals in the rib 17 This insures all the lens blanks being properly located. After the lens blanks are located in the manner specified, the presser means for each blank is brought into action by changing the same from the position shown in Fig. 3 to that shown in Fig. 1.

The means for pressing the individual blanks into tight positive contact with the metal surface of the spotting wheel consists in a presser head 20 on the inner end of a plunger rod 21, which extends through the side of the frame 15 and 'has a tubular bearing 22 which extends radially therefrom, as shown. The plunger rod and head 20 are forced inwardly into the position as shown in Fig; l by a spiral spring 23 surrounding the rod and lying between the presser head 20 and the side wall of the frame 15. The inner end of the presser head is curved as shown at 24 in Fig. 4: so as to conform to the curvature of the outer surface of the lens blank. The face of said head 20 should be changed to accommodate itself to the surface of the blank.

When it is desired to release the lens blanks the presser head is withdrawn by the hand wheel 25 on the outer end of the rod 21 to the position shown in Fig. 3, and is held in such position by a pin 26 projecting laterally from the rod 21 and engaging the outer end of the projection or guide 22. This projection or guide 22 is longitudinally slotted at 27 so that after the lens blanks have been put in place against the wheel by hand, the rod 21 maybe turned so that the pin 26 will enter the slot 27 and then the spring 23 will force the presser head against the lens blank. There is one of these pressing mechanisms provided for each lens blank, as shown in Fig. 1.

The invention claimed is: V

1; A' frame for mounting a spotting wheel, and individual means mounted therein for independently pressing a lens blank on each spot of said Wheel. 7

2. A frame for mounting a spotting wheel, and individual means yieldingly mounted in said frame and thereof for wheel. 7 7

3. A frame having a circular rim and means for mounting a spotting wheel therein concentrically with said rim, and independently operated presser means mounted in and operable through said rim and opposite each spot on the wheel for pressing pressing each lens blank on said the lens blanks onthe spots on said wheel.

4. A frame having a circular rim, means for mounting a spotting wheel therein concentrically with said rim, and independently operated yielding presser means mounted in and operable through said rim and opacting radially posite each spot on the wheel for pressing the lens blanks on the spots on said wheel.

5. A frame having a base and circular rim and a stud extending up from said base concentric with said rim on which a spotting wheel may be mounted and an upwardly projecting surface from the base of said frame on which to rest the side edge of the spotting wheelfor placing it in balancedposition in said frame, and presser means mounted in and operable through said rim radially of said frame for pressing a lens blank on the periphery of the spotting Wheel. e

6. A frame having a base and circular rim and a stud extending up from said base concentric with said rim on which a spotting wheel may be mounted, setting blocks on the bottom of said frame on which to place the lens blanks as they are placed against the periphery of the spotting wheel for getting them in their true position, and presser means mounted in and operable through said rim and opposite each spot on the wheel for pressing the. lens blanks on the spots on said wheel.

71A frame having a circular rim and means for mounting a spotting wheel therein concentrically with'said rim, a presser head for forcing a blank on said spotting Wheel, a rod radially movable through the rim of said frame, a spring between the presser head and rim for forcing the head inwardly, a tubular bearing extending outward from the rim of said frame and longitudinally'slotted, and a pin extending laterally from said rod so that when the rod is turned to bring the pin in registry with the slotthe springwill force the presser head inwardly and when the rod is turned to move'the pin out of registry with the slot the tubular bearingwill hold thepresser head outwardly.

In witness whereof I have hereunto affixed my signature.

, LUCIAN W. BUGBEE. 

